Question

3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程

Answer 1

原式=(3+8)(x-y)²+(-7+6)(x-y)

=11(x-y)²-(x-y)

原式=(5+3)xy+(-4+4)x²y+(-8-1)xy²

=8xy-9xy²